Medinac (Isotretinoin)

Isotretinoin is indicated for disorders of the pilosebaceous unit, primarily severe forms of acne.

• Severe recalcitrant nodular acne: markedly reduces inflammatory nodules and prevents new lesion formation.
• Acne vulgaris (moderate to severe): decreases comedones, papules and pustules, improving skin appearance.
• Cystic acne: resolves deep cystic lesions and limits scarring.

• Isotretinoin binds to nuclear retinoic acid receptors, modulating gene expression that leads to reduced sebaceous gland size and sebum output, normalization of follicular keratinization, and anti‑inflammatory effects, thereby addressing the pathogenic factors of acne.

Isotretinoin may cause a range of adverse reactions that vary in frequency and severity.

Common Side Effects

• Dry skin: excessive epidermal dryness and scaling.
• Cheilitis: cracking and inflammation of the lips.
• Xerosis of mucous membranes: dryness of eyes and nasal passages.
• Photosensitivity: increased susceptibility to sunburn.
• Elevated triglycerides: mild to moderate rise in serum lipid levels.
• Transient myalgia: occasional muscle aches.

Serious or Rare Side Effects

• Severe depression or suicidal ideation.
• Inflammatory bowel disease exacerbation.
• Hepatotoxicity: significant elevation of liver enzymes.
• Pancreatitis: acute inflammation of the pancreas.
• Teratogenicity: birth defects if exposure occurs during pregnancy.
• Severe hypercalcemia: elevated calcium levels requiring medical attention.

Isotretinoin requires careful monitoring and specific safety measures.

• Pregnancy contraindication: avoid use in pregnant women due to high teratogenic risk.
• Contraception requirement: effective birth control must be used before, during, and after therapy.
• Liver function monitoring: periodic assessment of hepatic enzymes is advised.
• Lipid profile monitoring: check serum triglycerides and cholesterol regularly.
• Avoid vitamin A supplementation: excess retinoids increase toxicity risk.
• Store at below 25°C: keep in the original packaging, protect from moisture and direct sunlight.

Isotretinoin can interact with other medicines, altering efficacy or safety.

Major Interactions (Avoid)

• Tetracyclines: increased risk of intracranial hypertension.
• Vitamin A supplements: additive retinoid toxicity.
• Other systemic retinoids: cumulative adverse effects.

Moderate Interactions (Monitor Closely)

• Oral contraceptives: possible reduction in contraceptive effectiveness.
• Enzyme‑inducing anticonvulsants (e.g., carbamazepine): may lower isotretinoin plasma levels.
• Azole antifungals (e.g., ketoconazole): can raise isotretinoin concentrations, requiring dose adjustment.